What is it about?
Here we show that emission yield also depends on the molecular structure of spacer unit. Selecting structurally flexible biphenyl spacer unit instead of rigid fluorene was shown to selectively enhance the nonradiative decay rate of triplet states (kTNR), leading to the lowered yield of delayed fluorescence (from 0.55 to 0.43). However, more rapid kTN R led in weaker OLED external quantum efficiency (EQE) roll-off due to lowered triplet lifetime, though at the cost of lower peak efficiency.
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Why is it important?
Our study highlights the importance of proper selection of spacer fragment and showcases that even the negligible structural alterations of molecular core may have evident implications to emission properties.
Perspectives
We hope that the obtained data will be useful for the design of highly efficient TADF emitters.
Dr. Sigitas Tumkevicius
Vilnius University
Read the Original
This page is a summary of: Modulation of nonradiative emission decay rate by spacer unit in donor-acceptor TADF compounds, Dyes and Pigments, December 2023, Elsevier,
DOI: 10.1016/j.dyepig.2023.111711.
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